Java集合（容器）

 Collection<E>

//集合
Collection<String> collection = new ArrayList<>();
collection.add("Monday");
collection.add("Tuesday");
collection.add("Wednesday");
collection.add("Thursday");
collection.add("Friday");

String c = collection.toString();
printIn(c);

 

List<E>

//链表
List<String> list = new LinkedList<>();
list.add("Monday");
list.add("Tuesday");
list.add("Wednesday");
list.add("Thursday");
list.add("Friday");

String l = list.toString();
printIn(l);

 

LinkedList<E>

LinkedList<String> link = new LinkedList<>();
link.add("Monday");
link.add("Tuesday");
link.add("Wednesday");
link.add("Thursday");
link.add("Friday");

String ll = link.toString();
printIn(ll);